<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>08_相对定位</title>
    <style>
        .fu{background-color: #ff0}
        .fu>div {width:100px;height:100px;}
        .z1{background-color: #f00;}
        .z2{
            background-color: #0f0;
            /*
            固定定位:会脱离文档流 释放布局空间
            移动参照物:html根元素
            */
            position: fixed;
            right:0;
            bottom: 0;
        }
        .z3{background-color: #00f;}
    </style>
</head>
<body>
<div class="fu">
    <div class="z1"></div>
    <div class="z2"></div>
    <div class="z3"></div>
</div>

</body>
</html>